<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .one {
        /* ta */
        text-align: center;
        /* w100 */
        width: 100px;
        /* tdn */
        text-decoration: none;
    }
</style>

<body>
    <!-- div(Enter) -->
    <div></div>

    <!-- div*5 -->
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>

    <!-- ul>li -->
    <ul>
        <li></li>
    </ul>

    <!-- div+p -->
    <div></div>
    <p></p>

    <!-- p.one -->
    <p class="one"></p>

    <!-- ul>li#two -->
    <ul>
        <li id="two"></li>
    </ul>

    <!-- .demo$*5 -->
    <div class="demo1"></div>
    <div class="demo2"></div>
    <div class="demo3"></div>
    <div class="demo4"></div>
    <div class="demo5"></div>

    <!-- div{你好啊} -->
    <div>你好啊</div>
</body>

</html>